diff --git a/tdes/rtl/verilog/tdes.v b/tdes/rtl/verilog/tdes.v
new file mode 100644
index 0000000..76ff2a8
--- /dev/null
+++ b/tdes/rtl/verilog/tdes.v
@@ -0,0 +1,129 @@
+// ======================================================================
+// TDES encryption/decryption
+// algorithm according:FIPS 46-3 specification
+// Copyright (C) 2012 Torsten Meissner
+//-----------------------------------------------------------------------
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write:the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+// ======================================================================
+
+
+`timescale 1ns/1ps
+
+
+module tdes
+  (
+    input             reset_i,  // async reset
+    input             clk_i,    // clock
+    input             mode_i,   // des-mode: 0 = encrypt, 1 = decrypt
+    input      [0:63] key1_i,   // key input
+    input      [0:63] key2_i    // key input
+    input      [0:63] key3_i    // key input
+    input      [0:63] data_i,   // data input
+    input             valid_i,  // input key/data valid flag
+    output reg [0:63] data_o,   // data output
+    output            valid_o,  // output data valid flag
+    output reg        ready_o   // ready for new data
+  );
+
+
+`include "../../rtl/verilog/des.v"
+
+
+  reg reset;
+  reg mode;
+  reg [0:63] key1;
+  reg [0:63] key2;
+  reg [0:63] key3;
+  reg ready_o;
+
+
+
+  // input register
+  always @(posedge clk_i, negedge reset_i) begin
+    if (~reset_i) begin
+      reset <= 0;
+      mode  <= 0;
+      key1  <= 0;
+      key2  <= 0;
+      key3  <= 0;
+    end
+    else begin
+      reset <= reset_i;
+      if (valid_i && ready_o) begin
+        mode <= mode_i;
+        key1 <= key1_i;
+        key2 <= key2_i;
+        key3 <= key3_i;
+      end
+    end
+  end
+
+
+  // output register
+  always @(posedge clk_i, negedge reset_i) begin
+    if (~reset_i) begin
+      ready_o <= 0;
+    end
+    else begin
+      if (valid_i && ready_o) begin
+        ready_o <= 0;
+      end
+      if (valid_o || (reset_i && ~reset)) begin
+        ready_o <= 1;
+      end
+    end
+  end
+
+
+  des : i1_des
+  (
+    .reset_i(reset_i),
+    .clk_i(clk_i),
+    .mode_i(mode_i),
+    .key_i(des1_key),
+    .data_i(data_i),
+    .valid_i(des1_validin),
+    .data_o(des1_dataout),
+    .valid_o(des1_validout)
+  );
+
+
+  des : i2_des
+  (
+    .reset_i(reset_i),
+    .clk_i(clk_i),
+    .mode_i(des2_mode),
+    .key_i(key2),
+    .data_i(des1_dataout),
+    .valid_i(des1_validout),
+    .data_o(des2_dataout),
+    .valid_o(des2_validout)
+  );
+
+
+  des : i3_des
+  (
+    .reset_i(reset_i),
+    .clk_i(clk_i),
+    .mode_i(mode_i),
+    .key_i(des1_key),
+    .data_i(des2_dataout),
+    .valid_i(des2_validout),
+    .data_o(data_o),
+    .valid_o(valid_o)
+  );
+
+
+endmodule